Danfoss 061B110866 Bellows Type Pressure Switch

Product Overview

The 061B110866 (061B110866) is a professional-grade industrial pressure switch manufactured by Danfoss, engineered for high-precision monitoring in vacuum and low-pressure systems. Utilizing a high-sensitivity bellows sensing element, this device is designed to trigger electrical contact changes with extreme repeatability when system pressure reaches a predefined setpoint. The 061B110866 is an essential safety and control component in industries such as marine engineering, water treatment, and industrial heating. With an IP65 enclosure rating, it provides robust protection against dust and low-pressure water jets, ensuring stable operation even in harsh, moisture-prone environments.

Technical Configuration

The 061B110866 belongs to a specialized range of pressure controls characterized by a G-type threaded connection and a durable bellows mechanism. The bellows design is superior for low-pressure applications, offering much finer sensitivity than traditional piston-style switches. This specific model features the "66" code setting range, covering a critical window from -0.20 to 1.00 bar, making it ideal for vacuum monitoring or low-pressure gas management. The electrical interface uses a standard Pg 11 connection for secure industrial wiring. Internally, the Single Pole Double Throw (SPDT) contact system allows for flexible control logic, supporting both "normally open" and "normally closed" configurations to suit specific automation requirements.

Technical Specifications

Technical FAQs

What is the primary advantage of the bellows element in the 061B110866?

The bellows element provides superior accuracy and lower hysteresis in the -0.20 to 1.00 bar range. Unlike diaphragms, the bellows can handle the mechanical stresses of vacuum and low pressure while maintaining a high burst pressure resistance of 15.0 bar.

Is this switch suitable for marine engine room environments?

Yes. The 061B110866 is built to withstand the high-vibration and high-humidity conditions typical of marine environments. Its IP65 rating and robust mechanical construction ensure long-term reliability on board vessels and in industrial plants.

Can I use this switch for both high-pressure alarms and low-pressure cut-outs?

Yes. Because the unit features an SPDT contact system, it can be wired to either break the circuit or make the circuit upon reaching the setpoint, allowing it to function as either a high-limit or low-limit controller.

Engineering & Installation Guide

• Vibration Mitigation: To prevent contact chatter or premature wear of the bellows, mount the pressure switch on a surface free from excessive vibration. In systems with high-pressure pulsations, install a capillary tube or a dampening snubber between the G-thread connection and the pressure source.

• Wiring Integrity: When utilizing the Pg 11 electrical connection, ensure the cable diameter is compatible with the gland to maintain the IP65 seal. Use ferrules on all stranded wire ends to ensure a gas-tight, high-torque connection at the internal terminal block, preventing signal drift or localized heating.

• Orientation Best Practices: For optimal accuracy, especially when operating in the vacuum range (-0.20 bar), it is recommended to mount the bellows in a vertical orientation. This prevents the weight of internal mechanical components from introducing a slight offset to the factory calibration.